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The AC90 can do 1080 60P which may be an issue for a monitor (and HDMI?) Check your monitor settings an see if you can change the input until you see the image.
I *think* there is an output setting on the AC90 which can be adjusted maybe to 1080i or 1080 30P. I'm sorry I cannot remember now as it's been a while since I went into the settings on it. I use my AC90A with a monitor frequently and it works fine but it's been close to 2 years since I had to configure it.